An estimated five million people in the UK took part in Dry January in 2017.

One expert in addiction and mental health, York University lecturer Ian Hamilton said: “I think it would help if there was a more robust evaluation of what goes on after Dry January.

“Many people who sign up to it probably don’t have that great a problem with alcohol so they find it relatively easy.”

Those with an alcohol problem were unlikely to be helped by the campaign, he said, adding that even if they signed up, it was inadvisable for dependent drinkers to give up alcohol abruptly since it could result in side effects ranging from headaches to convulsions.

The NHS has said that whether you are taking part in Dry January or not, keeping your alcohol consumption within recommended limits is wise all year round.